I built on the great concept of the original model and redesigned it with a magnetic mount, similar to the original Tooltop lens. If you need a different shape for the magnets, let me know in the comments, and I'll (hopefully) create a version for you.
You will need:
2x Round Neodymium Magnet 3x10mm
2x M2*4mm screws
2x M2*2.5*3.2
101.6mm 20mm ZnSe Lens
I bought lens here, because I came with silicone washer. which is needed too:
The author remixed this model.
I reworked the entire mounting system from a clip-based to a magnetic system. The ring around the camera lens now fits more tightly. The screw holes have been enlarged to accommodate different types of screw heads.